Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31a729885274e83…

MALICIOUS

PDF

112.5 KB Created: 2021-09-18 10:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3f02f4b29a93f0a645938c68ab709ff SHA-1: 5ae35fbeb37513dd9829670851234798b8aec02b SHA-256: d31a729885274e8306702c46081ca82e1b371dab28a67cd0c2a2637fad0748ab
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or IP addresses, suggesting an attempt to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade initial security checks. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=anti+adblock+killer+android PDF link annotation
    • http://sten.kr/club/data/userfiles/file/20210907041600.pdfIn PDF document text
    • https://cartolmania.it/file/dalobiboz.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396cdb9529e---vafonil.pdfPDF link annotation
    • http://nuovartea.eu/userfiles/files/foxatoxorufi.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/sifekijijazarenegizulo.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/judejakizimesulanub.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/52806786950.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/vobibotute.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xajuvejinasagale.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161439170d2d1a---wigagemezafuridakes.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f2bc32e9---90619581431.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/64338679659.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/govuzelozeluputotez.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/60279849496.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/jonironojavab.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wagasejomujotizorupir.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/guzuzozovi.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/tejov.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/90692437821.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b83c8a40e874909d57733e37d5fd3f80/79053075851.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613200211b7ba---66393214015.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/24462214175.pdfIn PDF document text
    • https://membermimpi.com/contents/files/44759936456.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 22420 bytes
SHA-256: 61ba8d7cc53e69e5b29ece47345ae47e970add747b5edd2227f980e24d857a87
font_01_sfnt_off00018506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D1D 10408 bytes
SHA-256: 55d6a5d286867f2b6b8d6c072326807d906a4dc0abd8431902b41d27bb102ee3

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